# Safety Information | EON800 Tether System

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The EON800 operates using an 800V DC power tether cable, presenting specific electrical hazards that require careful consideration. The following section outlines potential risks and the best practices for hazard avoidance. While operating any UAV involves inherent risks, following proper procedures can significantly mitigate these risks, although complete elimination may not be possible.
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### Safety Information

* **High Voltage Exposure (800V DC):**\
  The tether system delivers 800V DC to power the aircraft. This voltage level is inherently dangerous and poses a risk of electric shock or serious injury if contacted.
* **Lightweight Cable Construction:**\
  To reduce weight in the air, the EON800 tether cable uses a single insulation layer per conductor, reinforced with a Kevlar braid for strength and durability. If the tether cable is damaged, dangerous voltages may be exposed, and operation should be immediately stopped.
* **Areas of concern:**\
  When the 800V DC system is active, **dangerous voltages may be present throughout the tether cable, APU, and connectors**. Damage to the tether cable or components could cause dangerous voltages to transfer to the aircraft. The tether cable, air power unit, aircraft, and all connected components should be considered hazardous while the 800V DC system is operating..
* **Residual Charge After Shutdown:**\
  Even when the system is powered off, dangerous voltages may remain in the tether cable and components for up to 30 seconds due to internal capacitance.
* **Risk During Fault Conditions or Crashes:**\
  In the event of a system fault, disconnection, or crash, hazardous voltage may still remain in the tether or drone until the power is fully shut down and dissipated.
* **AC Supply Safety:**\
  Safe operation depends on using an **AC input supply that meets the requirements in this manual**.\
  The AC source should include a **neutral–earth bond** and a **real connection to earth potential** (for example, building earth or a local grounding electrode).

### Safe Operation Guidelines

1. **Inspect Before Each Use**
   * Carefully inspect the T**ether cable, connectors, APU, and TGS** for any visible damage damage.
   * **Do not operate** if damage is found. Contact the manufacturer for guidance.
2. **Connection Before Power**
   * **NEVER** power **ON the Tether Ground Station** (**TGS**) until the tether cable is securely connected at both ends (APU and TGS).
3. **Handling Rules (During Operation)**
   * **DO NOT** touch the tether cable, APU, aircraft, or parts connected to the aircraft while the 800V DC system is active.
   * If contact is unavoidable, **wear insulating gloves rated for at least 1000V**.
   * Keep untrained personnel away - **use cones or barriers** to define a safe perimeter.
4. **Power Timing**
   * Activate HV power **only immediately before takeoff**, and shut it off **immediately after landing**.
5. **Emergency & Fault Handling**
   * In the event of a crash or system fault, **turn off the 800V DC power before the drone contacts the ground**.
   * Monitor the system during operation. If any hazard is detected, **immediately power down the 800V DC system**.
6. **Pre-Flight Safety Briefing**
   * Provide a short briefing to anyone present around the drone system, especially during demonstrations or field operations.
   * **Nominate a tether operator** to be responsible for controlling access to the designated safety perimeter and ensuring that no one enters the area while the high-voltage system is active.